Calendar of Physics Talks Vienna

Topological Photonics with Twisted Resonators and Braided Circuits
Speaker:Jonathan Simon (University of Chicago)
Abstract:I will present recent work exploring topological phases of photons. Beginning with a spin-hall meta-material for RF photons in coupled resonators (in conjunction with the SchusterLab), I will proceed to a description of recent progress towards strongly interacting topological microwave circuits. I will also describe a parallel effort demonstrating Landau levels for optical photons in non-planar (twisted) optical resonators, and work to mediate strong interactions between harmonically confined, massive photons using resonator Rydberg-EIT. This work holds short-term promise for dissipative production of photonic Laughlin states, and long-term potential as a route to controlled studies of anyons.
Date: Mon, 09.11.2015
Time: 17:00
Duration: 60 min
Location:Ernst-Mach Hörsaal, 2. Stck.,Strudlhofgasse 4, 1090 Wien
Contact:www.coqus.at / Christina Becker

The Path Towards Single Atom Magnets
Speaker:Prof. Dr. Harald Brune (Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Féderale de Lausanne (EPFL), Lausanne/Switzerland)
Abstract:Making magnets smaller increases thermal fluctuations of the magnetization direction, magnetization reversal by tunneling, or by scattering with conduction electrons. A magnet is defined as having magnetic bistability (remanence and coercitivity) requiring the spin relaxation time T1 to be larger than the observation time. We briefly review the state of the art in molecular magnets and of clusters assembled at surfaces. We then turn to the ultimate question: Can a single atom be a magnet in a sense that it exhibits remanence, or at least a significant opening of the magnetization curve at higher fields? Since the initial report of large magnetic anisotropy energies for single surface adsorbed atoms of 3d elements, many groups reported similarly large values, with Co on MgO(100) being the current record. Nevertheless, these atoms are all perfectly paramagnetic. Recently published spin-po
Date: Tue, 10.11.2015
Time: 16:00
Location:Technische Universität Wien, Institut für Angewandte Physik, E134 yellow tower „B“, 5th floor, Sem.R. DB gelb 05 B (room number DB05L03) 1040 Wien, Wiedner Hauptstraße 8-10
Contact:Univ.Prof. Dr. Ulrike Diebold

Unitarisation of Anomalous Couplings in Vector Boson Scattering
Speaker:Maximilian Löschner (Univ. Wien)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Tue, 10.11.2015
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, W. Grimus

Single-Atom Catalysis: An Atomic-Scale View
Speaker:Ass.Prof. Dr. Gareth S. Parkinson
Date: Tue, 10.11.2015
Time: 17:30
Duration: 60 min
Location:Lise-Meitner Hörsaal (ehemal. Großer Hörsaal der Experimentalphysik), Universität Wien
1090 Wien, Strudlhofgasse 4 / Boltzmanngasse 5

Conformal properties of the Schwarzschild-de Sitter spacetime
Speaker:Juan Valiente-Kroon (London)
Abstract:im Rahmen des Literaturseminars: In this talk I will show how the asymptotic initial value problem for the conformal Einstein field equations, whereby one prescribes initial data on a spacelike hypersurface representing the conformal boundary, can be used to study various conformal aspects of the Schwarzschild-de Sitter spacetime. The analysis presented covers the subextremal, extremal and hyperextremal cases.
Date: Thu, 12.11.2015
Time: 14:00
Duration: 60 min
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum, 5. Stock, 1090 Wien
Contact:P.T. Chrusciel